Table 3 Median [1st, 3rd] quartiles of HRV indices in the three Rassi risk groups

− 5.09 [− 7.74, − 2.94]

− 3.42 [− 4.30, − 2.79]

− 3.64 [− 4.75, − 2.70]

0.547

4.69 [3.47, 8.38]

3.14 [2.78, 4.43]

3.65 [2.93, 5.39]

0.371

51.5 [49.0, 53.1]

49.3 [47.6, 50.1]

50.0 [47.6, 51.4]

0.298

51.4 [48.5, 54.9]

49.6 [47.0, 50.8]

50.8 [48.7, 55.1]

0.249

0.42 [-0.75, 2.65]

-0.41 [-0.85, 0.05]

0.46 [-0.13, 1.89]

0.141

0.98 [0.91, 1.17]

1.11 [0.85, 1.30]

0.94 [0.73, 1.12]

0.525

1.66 [1.52, 1.94]

1.60 [1.25, 1.87]

1.38 [1.20, 1.75]

0.334

4.46 [4.10, 4.67]

4.43 [4.20, 4.56]

4.20 [3.93, 4.68]

0.942

0.67 [0.64, 0.76]

0.67 [0.60, 0.72]

0.69 [0.63, 0.77]

0.526

1.64 [1.33, 1.78]

1.59 [1.39, 1.71]

1.45 [1.29, 1.77]

0.992

2.51 [2.48, 2.55]

2.51 [2.48, 2.56]

2.55 [2.53, 2.56]

0.268

0.91 [0.90, 0.91]

0.88 [0.87, 0.91]

0.87 [0.86, 0.89]*

0.039

1.87 [1.49, 2.04]

1.81 [1.51, 2.10]

1.69 [1.53, 1.92]

0.956

58.2 [53.4, 63.3]

63.4 [55.8, 66.8]

66.4 [63.5, 71.2]*

0.032

2.6 [1.3, 3.5]

1.1 [0.4, 3.7]

1.0 [0.6, 2.8]

0.410

30.2 [18.4, 40.5]

21.5 [15.4, 31.8]

13.2 [9.7, 26.4]

0.066

58.5 [44.0, 65.7]

58.3 [46.5, 63.7]

56.1 [47.7, 68.7]

0.727

10.5 [8.3, 13.4]

16.5 [11.5, 22.9]

22.2 [13.3, 27.5]

0.062

24.5 [10.7, 43.5]

20.7 [7.6, 31.8]

23.2 [6.2, 30.9]

0.806

46.8 [39.4, 50.4]

44.9 [31.6, 48.9]

39.6 [30.3, 50.0]

0.324

5.6 [2.3, 8.8]

4.5 [1.7, 8.0]

4.8 [1.3, 6.2]

0.795

19.0 [12.6, 24.7]

22.3 [17.7, 34.4]

31.2 [21.3, 38.4]

0.417

57.5 [18.0, 119.7]

48.6 [19.6, 154.5]

60.5 [17.6, 104.1]

0.869

66.5 [27.2, 235.6]

47.3 [27.2, 107.1]

72.0 [38.5, 126.6]

0.789

1.42 [0.61, 1.82]

1.01 [0.57, 2.63]

0.53 [0.32, 1.79]

0.380

847 [779, 980]

1037 [843, 1111]

1059 [932, 1090]

0.132

20.7 [16.6, 35.0]

20.1 [12.4, 27.2]

23.5 [16.1, 37.8]

0.534

16.7 [8.0, 26.9]

13.5 [9.2, 20.2]

20.7 [16.5, 25.1]

0.663

6.28 [4.73, 9.27]

5.92 [3.73, 7.97]

6.76 [4.85, 9.42]

0.776

85.9 [70.3, 132.8]

89.8 [54.7, 119.1]

89.8 [68.4, 117.2]

0.857